Name: ________________________ Class: ___________________ Date: __________
ID: A
Science 9 Review
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
____
1. Conductors allow electric charges to move easily through them.
____
2. Like charges attract each other and opposite charges repel each other.
____
3. You can ground a charged object by connecting it to Earth with a conductor.
____
4. The amount of charge passing a point in a conductor per unit of time is measured in coulombs.
Use the circuit diagram to answer the next question.
____
5. In the circuit diagram, C represents the source for the electrical circuit.
____
6. In the symbol for a cell, the shorter line symbolizes the negative terminal.
____
7. Static electricity is more useful as an energy source than current electricity.
____
8. As more resistors are added to a parallel circuit, the total resistance of the circuit increases.
____
9. A 1400 W electric baseboard heater consumes more energy per minute than does a 1000 W kettle.
____ 10. The unit kW•h is a measure of energy consumption.
____ 11. In a parallel circuit, the potential difference across each load is equal.
____ 12. In a series circuit, the sum of the current through each resistor is equal to the total current through the circuit.
1
Name: ________________________
ID: A
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 13. What charge will a material take on if it gains electrons?
a. negative
b. neutral
c. no charge
d. positive
____ 14. A metal sphere is charged by touching it with a charged rod. Which charging process was used?
a. conduction
b. friction
c. induction
d. insulation
____ 15. What are materials that prevent charges from moving freely called?
a. balanced
b. conductors
c. insulators
d. unbalanced
____ 16. Which surface will a balloon that is rubbed against your head most likely stick to?
a. a metal wall
b. a wooden wall
c. neither a metal wall nor a wooden wall
d. a metal wall and a wooden wall
The diagram illustrates the charge on three different objects, A, B, and C. Use the diagram to answer the
next question.
____ 17. Which describes object A?
a. conductor
b. negatively charged
c. neutral
d. positively charged
____ 18. Which describes object B?
a. insulator
b. negatively charged
c. neutral
d. positively charged
2
Name: ________________________
ID: A
____ 19. Which statement below is true?
a.
b.
c.
d.
Object A will attract object B.
Object A will attract object C.
Object B will repel object A.
Object B will repel object C.
____ 20. Why are electrical wires usually constructed of metals?
a. Metals are commonly found in long, thin forms.
b. Metals are often shiny and malleable.
c. Metals do not provide an easy path through which electrons can travel.
d. Metals have many loosely held electrons.
____ 21. What are the two kinds of electric charges?
a. electron and neutron
b. negative and proton
c. neutral and charged
d. positive and negative
Use the diagram to answer the next question.
____ 22. What is the best way to measure the current through the circuit?
a. an ammeter connected to the positive and negative terminals of the battery
b. an ammeter inserted between the battery and the switch
c. a voltmeter connected to the positive and negative terminals of the battery
d. a voltmeter inserted between the battery and the switch
3
Name: ________________________
ID: A
____ 23. In order for current to flow around the circuit, which condition must be satisfied?
a. An ammeter must be placed in the circuit.
b. Both wires must be connected to the positive terminal of the battery.
c. The switch must be in the closed position.
d. The switch must be removed from the circuit.
____ 24. What is the unit of measurement for electric current?
a. ampere
b. charge
c. electron
d. volt
____ 25. What is the common name for potential difference?
a. amperes
b. current
c. joules
d. voltage
____ 26. Which statement best describes Ohm’s law?
a. Current equals charge divided by time.
b. Potential difference equals energy divided by charge.
c. Resistance equals current divided by potential difference.
d. Resistance equals potential difference divided by current.
____ 27. When the switch is opened, what happens to the electrons in the circuit?
a.
b.
c.
d.
More are added.
Some are removed.
They begin to move.
They stop moving.
____ 28. Which feature of an electric circuit describes what slows down the flow of electrons?
a. current
b. potential difference
c. resistance
d. voltage
4
Name: ________________________
ID: A
____ 29. What is the current through the circuit shown?
a.
b.
c.
d.
0.67 A
1.5 A
3.0 A
72 A
____ 30. What is the effect of doubling the resistance of the lamp in the circuit shown without changing the voltage of
the battery?
a.
b.
c.
d.
The current is doubled.
The current is halved.
The current is quadrupled.
The current is unchanged.
____ 31. In a standard flashlight battery, from which terminal do the electrons leave?
a. negative terminal
b. neutral terminal
c. positive terminal
d. voltage terminal
5
Name: ________________________
ID: A
____ 32. Three identical resistors are connected in series to a 6 V power supply. An ammeter is used to determine the
total current (I) through the 6 V power supply circuit. Which equation will give the resistance of the second
resistor?
a. Resistance = 6 V  I
b. Resistance = 6 V  I
c. Resistance = 6 V  3I
d. Resistance = 6 V  3I
Use the diagram to answer the next question.
____ 33. A second identical bulb is added to the circuit by connecting it from point B to point C. Which statement is
true?
a. The new bulb is brighter than the original lamp.
b. The original bulb is brighter than the new lamp.
c. The two bulbs are of equal brightness, and are as bright as the single bulb was.
d. The two bulbs are of equal brightness, but are dimmer than the single bulb was.
____ 34. If a family receives an electric bill of $122.00 for a month, and the power company charges 10 cents per
kW•h of energy, how much energy did the family use?
a. 122 kW•h
b. 1220 kW•h
c. 12 200 kW•h
d. 122 000 kW•h
____ 35. A home theatre requires 10 A to operate. What is the power of the theatre when it is connected to a 120 V
household circuit?
a. 12 W
b. 83 W
c. 1200 W
d. 8300 W
6
Name: ________________________
ID: A
____ 36. How much does it cost to run a 2 kW freezer for 24 h if the cost of energy is 10 cents per kilowatt-hour?
a. $0.48
b. $1.20
c. $2.40
d. $4.80
____ 37. A 240 W laptop computer requires 10 A to operate. What is the voltage produced by the computer’s battery
pack?
a. 12 V
b. 24 V
c. 2400 V
d. 1200 V
____ 38. If a clothes dryer consumes 435 W of power in 3 min, how much energy has been used by this appliance?
a. 1305 J
b. 78 300 J
c. 216 000 J
d. 783 000 J
____ 39. Why are scientists and engineers developing electrical energy alternatives such as wind, solar, and fuel cells?
a. Electrical energy alternatives are less efficient.
b. Electrical energy generation should minimize any damage to the environment.
c. The cost of fossil fuels is decreasing.
d. The supplies of non-renewable energy sources are unlimited.
____ 40. In Canada, why is solar energy used to produce only small amounts of electricity?
a. A lot of sunlight is available.
b. Solar cells are expensive.
c. Solar cells are very efficient.
d. Solar cells damage the environment.
Matching
Match each description with the correct term.
a. the unit of electric charge
d.
b.
c.
an equal number of positive charges and
negative charges
a type of plastic
e.
f.
____ 41. conductors
____ 42. neutral
____ 43. coulomb
____ 44. insulators
____ 45. acetate
7
glass, plastics, and dry wood are
examples
copper and aluminum are examples
a machine that can be used to create a
static charge
Name: ________________________
ID: A
Match each term with the correct description.
a. electron
d.
b. proton
e.
c. neutron
nucleus
atom
____ 46. has a positive charge
____ 47. has a negative charge
____ 48. contains neutrons and protons
____ 49. has no electric charge
____ 50. a small particle of matter
Match each diagram with the correct circuit component.
a.
d.
b.
e.
c.
f.
____ 51. bulb
____ 52. conducting wire
____ 53. open switch
____ 54. battery
____ 55. closed switch
____ 56. cell
Short Answer
57. Explain the purpose of a lightning rod.
8
Name: ________________________
ID: A
Use the illustration to answer the next question.
58. Which law of static charge is not represented in the illustration?
59. List three devices that use the properties of static electricity. Briefly describe what each device is used for.
60. In order for a light bulb to work properly, how must its resistance compare to the resistance of the wire?
Explain.
61. Will the bulb in the circuit glow? If not, explain why.
62. A set of LED lights plugs into a 110 V supply. If the current through the lights is 0.05 A, what is the
resistance of the set of lights?
63. An electric motor has a resistance of 200 . It is connected to a power source that has a potential difference
of 120 V. Calculate the current that flows through the motor. Show your work.
64. What is the relationship between the resistance and the power rating of an electrical device connected to a
constant potential difference? (Hint: Use the equations P = IV and
9
to answer the question.)
ID: A
Science 9 Review
Answer Section
MODIFIED TRUE/FALSE
1. ANS: T
PTS: 1
TOP: Static Electricity
KEY: conductors
MSC: Level 1
2. ANS: F
Like charges repel each other and opposite charges attract each other.
PTS: 1
TOP: Static Electricity
KEY: laws of static charge
MSC: Level 1
3. ANS: T
PTS: 1
TOP: Static Electricity
KEY: grounding
MSC: Level 1
4. ANS: F
The amount of charge passing a point in a conductor per unit of time is measured in amperes.
PTS: 1
TOP: Current Electricity
KEY: amperes
MSC: Level 1
5. ANS: T
PTS: 1
TOP: Current Electricity
KEY: source | circuit components
MSC: Level 1
6. ANS: T
PTS: 1
TOP: Current Electricity
KEY: circuit diagrams
MSC: Level 1
7. ANS: F
Static electricity is less useful as an energy source than current electricity.
PTS: 1
TOP: Current Electricity
KEY: static electricity
MSC: Level 1
8. ANS: F
As more resistors are added to a parallel circuit, the total resistance of the circuit decreases.
9.
10.
11.
12.
PTS: 1
TOP: Resistance
KEY: parallel circuits
MSC: Level 1
ANS: T
PTS: 1
TOP: Power and Energy
KEY: power ratings
MSC: Level 1
ANS: T
PTS: 1
TOP: Power and Energy
KEY: kilowatt-hour
MSC: Level 1
ANS: T
PTS: 1
TOP: Resistance
KEY: parallel circuits | voltage
MSC: Level 1
ANS: F
In a series circuit, the current through any one resistor is equal to the total current through the circuit.
PTS: 1
MSC: Level 1
TOP: Resistance
KEY: current | series circuit
1
ID: A
MULTIPLE CHOICE
13. ANS:
KEY:
14. ANS:
KEY:
15. ANS:
KEY:
16. ANS:
KEY:
17. ANS:
KEY:
18. ANS:
KEY:
19. ANS:
KEY:
20. ANS:
KEY:
21. ANS:
KEY:
22. ANS:
KEY:
23. ANS:
KEY:
24. ANS:
KEY:
25. ANS:
KEY:
26. ANS:
MSC:
27. ANS:
KEY:
28. ANS:
MSC:
29. ANS:
MSC:
30. ANS:
MSC:
31. ANS:
KEY:
32. ANS:
MSC:
33. ANS:
MSC:
34. ANS:
KEY:
A
PTS: 1
TOP:
electrons | negative charge
MSC:
A
PTS: 1
TOP:
charging by conduction | charging process
C
PTS: 1
TOP:
insulators
MSC: Level 1
B
PTS: 1
TOP:
attraction of neutral objects
MSC:
C
PTS: 1
TOP:
charge transfer | electron transfer
MSC:
D
PTS: 1
TOP:
charge transfer | electron transfer
MSC:
A
PTS: 1
TOP:
laws of static charge
MSC:
D
PTS: 1
TOP:
conductors
MSC: Level 3
D
PTS: 1
TOP:
negative charge | positive charge
MSC:
B
PTS: 1
TOP:
ammeter
MSC: Level 2
C
PTS: 1
TOP:
circuit components
MSC:
A
PTS: 1
TOP:
amperes
MSC: Level 1
D
PTS: 1
TOP:
potential difference | voltage
MSC:
D
PTS: 1
TOP:
Level 1
D
PTS: 1
TOP:
current
MSC: Level 2
C
PTS: 1
TOP:
Level 1
B
PTS: 1
TOP:
Level 2
B
PTS: 1
TOP:
Level 3
A
PTS: 1
TOP:
battery | negative terminal
MSC:
C
PTS: 1
TOP:
Level 3
C
PTS: 1
TOP:
Level 3
B
PTS: 1
TOP:
cost of energy
MSC:
2
Static Electricity
Level 1
Static Electricity
MSC: Level 1
Static Electricity
Static Electricity
Level 2
Static Electricity
Level 2
Static Electricity
Level 2
Static Electricity
Level 2
Static Electricity
Static Electricity
Level 1
Current Electricity
Current Electricity
Level 1
Current Electricity
Current Electricity
Level 1
Resistance
KEY: Ohm’s Law
Current Electricity
Resistance
KEY: resistance
Resistance
KEY: Ohm’s Law
Resistance
KEY: Ohm’s Law
Current Electricity
Level 1
Resistance
KEY: resistors in series
Resistance
KEY: parallel circuits
Power and Energy
Level 2
ID: A
35. ANS:
KEY:
36. ANS:
KEY:
37. ANS:
KEY:
38. ANS:
KEY:
39. ANS:
KEY:
40. ANS:
KEY:
C
PTS: 1
power
MSC: Level 2
D
PTS: 1
paying for electricity
B
PTS: 1
electrical power | voltage
B
PTS: 1
calculating energy consumption
B
PTS: 1
energy alternatives
B
PTS: 1
solar energy MSC: Level 1
TOP: Power and Energy
41. ANS:
KEY:
42. ANS:
KEY:
43. ANS:
KEY:
44. ANS:
KEY:
45. ANS:
KEY:
E
conductors
B
neutral
A
coulomb
D
insulators
C
acetate
PTS:
MSC:
PTS:
MSC:
PTS:
MSC:
PTS:
MSC:
PTS:
MSC:
1
Level 1
1
Level 1
1
Level 1
1
Level 1
1
Level 1
TOP: Static Electricity
46. ANS:
KEY:
47. ANS:
KEY:
48. ANS:
KEY:
49. ANS:
KEY:
50. ANS:
KEY:
B
protons
A
electrons
D
nucleus
C
neutrons
E
atoms
PTS:
MSC:
PTS:
MSC:
PTS:
MSC:
PTS:
MSC:
PTS:
MSC:
1
Level 1
1
Level 1
1
Level 1
1
Level 1
1
Level 1
TOP: Static Electricity
51. ANS:
KEY:
52. ANS:
KEY:
53. ANS:
KEY:
54. ANS:
KEY:
55. ANS:
KEY:
D
PTS: 1
TOP:
circuit components | bulbs
MSC:
F
PTS: 1
TOP:
circuit components | conducting wire
A
PTS: 1
TOP:
circuit components | open switch
MSC:
B
PTS: 1
TOP:
circuit components | battery
MSC:
C
PTS: 1
TOP:
circuit components | closed switch MSC:
TOP:
MSC:
TOP:
MSC:
TOP:
MSC:
TOP:
MSC:
TOP:
Power and Energy
Level 2
Power and Energy
Level 2
Power and Energy
Level 2
Alternate Sources of Energy
Level 1
Alternate Sources of Energy
MATCHING
TOP: Static Electricity
TOP: Static Electricity
TOP: Static Electricity
TOP: Static Electricity
TOP: Static Electricity
TOP: Static Electricity
TOP: Static Electricity
TOP: Static Electricity
3
Current Electricity
Level 1
Current Electricity
MSC: Level 1
Current Electricity
Level 1
Current Electricity
Level 1
Current Electricity
Level 1
ID: A
56. ANS: E
PTS: 1
KEY: circuit components | cell
TOP: Current Electricity
MSC: Level 1
SHORT ANSWER
57. ANS:
If lightning occurs, the large amount of charge will pass through the lightning rod to the ground therefore
protecting the building.
PTS: 1
TOP: Static Electricity
MSC: Level 1
58. ANS:
Neutral objects are attracted to charged objects.
KEY: grounding
PTS: 2
TOP: Static Electricity
KEY: laws of static charge
MSC: Level 3
59. ANS:
Any three (3) devices including the following:
- Air ionizer: is used to freshen air inside homes
- Paint sprayer: is used to ensure a smooth, even coat of paint on automobiles and other metal machinery
parts.
- Photocopier: uses the electrostatic properties of a metal called selenium to make copies of documents
- Lightning rod: uses a metal conducting wire and a pointed metal tip to conduct lightning discharges to the
ground
PTS: 6
TOP: Static Electricity
KEY: applications of static electricity | ionizers | lightning rod | paint | photocopier
MSC: Level 1
60. ANS:
The resistance in the light bulb’s filament must be far greater than in the conducting wire. This causes the
electrons’ electrical energy to be converted into heat and light energy. The wire has very little resistance, and
therefore the electrons travelling through the wire lose almost no electrical energy.
PTS: 2
TOP: Resistance
KEY: energy conversions | resistance
MSC: Level 2
61. ANS:
No. The bulb will not glow. Both wires are connected to the positive terminal of the cell. One wire must be
removed from this terminal and connected to the negative terminal.
PTS: 2
MSC: Level 1
TOP: Current Electricity
KEY: circuit components
4
ID: A
62. ANS:
The resistance is
PTS: 3
63. ANS:
.
TOP: Resistance
KEY: Ohm’s Law
MSC: Level 2
The current that flows through the motor is 0.6 A.
PTS: 3
TOP: Resistance
KEY: Ohm’s Law MSC: Level 2
64. ANS:
Power is the product of current and voltage. Given a constant voltage, power increases only with an increase
in current. Current is voltage divided by resistance. Given a constant voltage, current increases only with a
reduction in resistance. Therefore, the power of a device increases with a decrease in its resistance. That is, a
high-power device is one with a low resistance.
PTS: 3
MSC: Level 3
TOP: Power and Energy
KEY: power loss | resistance
5
Science 9 Review [Answer Strip]
A 19.
_____
ID: A
C 23.
_____
B 29.
_____
A 13.
_____
A 24.
_____
T
_____
1.
F
_____
2.
A 14.
_____
T
_____
3.
D 25.
_____
F
_____
4.
D 20.
_____
C 15.
_____
D 26.
_____
D 21.
_____
B 30.
_____
B 16.
_____
D 27.
_____
T
_____
5.
T
_____
6.
F
_____
7.
F
_____
8.
C 17.
_____
T
_____
9.
A 31.
_____
T 10.
_____
T 11.
_____
F 12.
_____
D 18.
_____
B 22.
_____
C 28.
_____
Science 9 Review [Answer Strip]
C 32.
_____
D 36.
_____
B 46.
_____
B 37.
_____
A 47.
_____
D 48.
_____
C 49.
_____
E 50.
_____
B 38.
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B 39.
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C 33.
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B 40.
_____
D 51.
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F 52.
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A 53.
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B 54.
_____
B 34.
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C 55.
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E 56.
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C 35.
_____
E 41.
_____
B 42.
_____
A 43.
_____
D 44.
_____
C 45.
_____
ID: A